Lost Horizon Films is a New York based independent film production company founded in 2021 by Karlis Bergs and Andrew Siedenburg after the two graduated from CalArts. Bergs and Siedenburg are co-directing Weeping Rocks, an observational film about the current drastic insect population decline and a scientist who has been single-handedly running the longest butterfly monitoring project in the world for the past 50 years.

In 2022, they received the Creatives Rebuild New York Artist Employment Grant to start work on a new documentary about environmental justice and land use issues within disadvantaged communities on Staten Island’s North Shore. In 2020, Siedenburg and Bergs finished The Threshold, which premiered at the Riga International Film Festival. The film portrays the world’s largest pollination event—when 2/3 of the United States’ bees are transported to pollinate almond farms in California’s Central Valley. The Threshold was made through the generous support of the Allan Sekula Social Documentary Grant.